Abstract
OBJECTIVE: This study aimed to determine the maximum inclusion rate of low-oil corn distillers dried grains with solubles (DDGS) in swine diets with a focus on growth performance and pork quality. METHODS: A total of 160 crossbred pigs with an initial body weight (BW) of 25.5 kg (standard deviation = 2.5) were randomly assigned to one of 5 dietary treatments in a randomized complete block design with BW and sex as blocking factors to obtain 8 replicates and 4 pigs per pen. The low-oil corn DDGS contained 26.3% crude protein, 24.5% neutral detergent fiber, and 3.7% ether extract. Five experimental diets based on the corn, soybean meal, and wheat were formulated to contain 0%, 10%, 20%, 30%, and 40% of the low-oil corn DDGS for each of 2 phases. RESULTS: During the overall period, average daily gain, average daily feed intake, and gain-to-feed ratio linearly decreased (p<0.05) as the low-oil corn DDGS inclusion rate increased. A one-slope broken-line analysis showed that the maximum inclusion rate of low-oil corn DDGS in swine diets without compromising gain-to-feed ratio was 16.5% during the overall period. The carcass characteristics were not affected by the inclusion of low-oil corn DDGS up to 40%. The firmness of loin and belly linearly decreased (p<0.05) as the low-oil corn DDGS inclusion rate increased. As the inclusion rate of low-oil DDGS increased, the saturated fatty acid content in both loin and pork belly linearly decreased (p<0.001), whereas the unsaturated fatty acid content linearly increased (p<0.001). The iodine value of lard also showed a linear increase (p<0.001) with increasing the low-oil corn DDGS inclusion rate. CONCLUSION: The maximum inclusion rate of low-oil corn DDGS in growing-finishing swine diets without detrimental effects on growth performance and pork quality was 16.5%.